68 mL of a 0.28 M CaCl2 solution is added to 92 mL of a 0.46 M CaCl2 solution. Determine the concentration of the combined solution. Show all work with units. How would you solve this?
I hope I would solve it correctly.
......I finally get a concentration with respect to
The basic definition of concentration is as amount of solute per unit volume. That is..........
Most of the time we want to assess
.........And in problems like these we must assume (REASONABLY!) that the volumes are additive. And so to address your problem (finally!), we solve the quotient:
Do the units in the quotient cancel to give an answer in
The concentration of the combined solution is 0.38 mol/L.
The steps to follow are:
- Calculate the number of moles in each solution.
- Use the total moles and the total volume to calculate the molarity of the combined solution.
1. Number of moles in each solution
(a) Solution 1
Molarity of combined solutions